1) Bees or Dees 2) Does road work 3) Flattens for driving 4) Inclines 5) Letters from school 6) Marks 7) Ratings 8) Report card features 9) Report card info 10) Report-card marks 11) School classes 12) School transcript info 13) Transcript listings 1) Hillsides 2) Marks 3) Raes 4) Ranks 5) Rates 6) Results 
For competition purposes, pipe bands are usually organised into grades, usually from 1 to 4, with grade 1 being the highest level.
Refers to the quality of a potentially deliverable commodity. It can refer to sulfur content for crude, country of origin for coffee or cocoa, or other distinguishing factors which influence the item. Often there is a schedule of premiums and discounts to adjust the invoice or delivery price for grade differences. 
A hint at how hard a problem is.